Clockwise Direction

[Sepideh_Em (Sepideh Emamzadehei)]

Does anyone know how I can achieve a clockwise or counterclockwise direction on these curves by grasshopper:

[laurent_delrieu]

There is no such thing for curves in general.
Clockwise or counterclockwise needs a closed curve and a reference direction or plane
You will find in Rhinocommon some tools
https://developer.rhino3d.com/api/rhinocommon/rhino.geometry.curve/closedcurveorientation

Sasquatch plugin has a tool for that.

[magicteddy]

This feels similar to this thread (from yesterday !).

Indeed a plane is required to get a notion of clockwise or anticlockwise.

Offset Curves towards or away from the center

Hello All, I have sets of curves arranged in a somewhat circular way: [image] What I would like to do is to have these curves flipped in the direction facing away from the center, so I can offset them all outwards [image] Unfortunately it’s always the case that some of the curves are flipped inwards, while some outwards, like you see here when I plug them in to the offset component: [image] [image] This is a simplified example, I have many more curves in different circular arrangement…

[Sepideh_Em (Sepideh Emamzadehei)]

Thank you so much @magicteddy

[laurent_delrieu]

I think there is a misunderstanding,

@Sepideh_Em

The component doesnt work with straight lines. I

I wrote

@laurent_delrieu

a closed curve and a reference direction or plane

A straight line is not a closed curve !!!

[rodwyll (robin_gdwl)]

Made a small script that checks a curve for its direction given a plane.

It utilises curve.ClosedCurveOrientation(plane) to check direction ( as mentioned by @laurent_delrieu above.
This function is only supposed to work with closed curves but also appears to work with simple open curves that are not self-intersecting

import Rhino

def is_clockwise(curve, plane):
    """
    Determine if a closed curve is oriented clockwise or counterclockwise
    relative to a given plane.
    
    Parameters:
    curve: The input closed curve.
    plane: The plane used to evaluate the orientation.
    
    Returns:
    Boolean: 1 = (Clockwise) or 0 (Counterclockwise).
    """

    # Result also seems valid for many open curves
    #if not curve.IsClosed:
        #return "The curve is not closed."
    
    orientation = curve.ClosedCurveOrientation(plane)
    if orientation == Rhino.Geometry.CurveOrientation.Clockwise:
        return 1
    elif orientation == Rhino.Geometry.CurveOrientation.CounterClockwise:
        return 0
    else:
        return -1

# Check orientation
if curve and plane:
    result = is_clockwise(curve, plane)
    
    if result == 1 : 
        text = "Clockwise"
    elif result == 0: 
        text = "Couterclockwise"
    else: 
        text = "Unknown Orientation "
else:
    raise Exception("Missing Inputs")

# Output
CW_bool = result  # Output orientation (string)
Direction_Text = text

Definition:
IsClockwise_01.gh (8.4 KB)
User Object:
Is Clockwise.ghuser (3.1 KB)